Double-acting door-check.



L. '11. MALONE 11 11. E. HUBBS. DOUBLE ACTING DOOR CHECK.

APPLICATION FILED NOV. 9, 1911.

1,070,708. Patented Aug. 19, 1913.

UNITED STATES PATENT OFFICE.

LEVI D. MALONE AND HENRY E. HUBBS, OF SHELBY, OHIO, ASSIGNORS TO THE SHELBY SPRING HINGE COMPANY, OF

SHELBY, OHIO, A CORPORATION OF OHIO.

Application filed. November 9, 1911.

To all whom it may concern Be it known that we, LEVI D. MALONE and HENRY E. HUBBs, citizens of the United States of America, residing at Shelby, in the county of Itichland and State of Ohio, have invented certain new and useful 11nprovements in Double-Acting Door-Checks, of which the following is a specification.

Our invention relates to double-acting door checks of the liquid type.

The objects of the invention are to provide a doorcheck that can be applied to a door and used in combination with a novel pivot plate to mount or swing the door; to provide means to regulate the speed of the return movement of the door after being opened; to provide means for permitting the partial return of the door after being opened, independent of the operating mechanism of the door-check; to provide means for pivoting the door from the center of its top edge and to provide a casing that is especially designed to be used in connection with the door-check operating mechanism.

The invention further consists of certain elements of construction hereinafter described and particularly pointed out in the claims.

The invention is illustrated in the accompanying drawing forming part of this application in which:

Figure 1 is a side elevation of my device, partly in section, showing it applied to the door and casing. Fig. 2 is a cross-sectional end view, partly in section, taken on the line m 00 of Fig. 1. Fig. 8 is a partial end view with part of the end removed to show the operation of the relief valve. Fig. i is a bottom View of the crank shaft plate showing the T shaped head of the crank shaft inserted in the recesses provided therefor.

In the drawings, reference resents a door and 2 and 8, plate t is fitted to the part 2 and held in place by the screws 5 or any other well-known fastening means. Adjacent to one end of the plate 4, an aperture 6 is provided and intersected by two recesses 7 and 8. The walls of the recesses are made straight as shown at 9, and the bottom 10 of said recesses fiat, the purpose of which will be described hereinafter. The casing 10 is provided with a downwardly projecting portion 11 which affords means through numeral 1 repthe casing. A of the casing Specification of Letters Patent.

which fits the crank pin 25 Patented Aug. 19, 1913.

Serial No. 659,373.

the medium of the screws 12 to fasten it on one end to the upper end of the door in substantial alinement with the plate 4:. A cover 18 having a groove 14 which fits over a rib 15 on the casing, (packing of any wellknown kind interposed therebetween) is provided and when the screws 16 are fastened, securely hold the cover to the casing, making a liquid or air-tight joint between the parts. All of the screws 16 are not shown but are provided on each corner of the cover. The cover is also provided with an outwardly projecting portion 17 which through the medium of the screws 18, is fastened to the upper edge of the door 1, as shown in Fig. 1. A boss 19 depends from the cover and is provided with a central aperture and counterbored concentric therewith, forming the tapered shoulder 20. A crank shaft 21 is fitted to the aperture and carries arms 22 and 28 forming with the crank shaft 21, a T shaped head which loosely fits in the aperture 6 of the plate 4 and the recesses 7 and 8 intersecting therewith. The lower part of the crank shaft depends into the casing and carries a crank 24 which in turn carries a crank pin 25. The crank shaft 21 and crank pin 25 are suspended upon the arms 22 and 28. The outer extremity of the shaft 21, however, extends through the aperture 6 formed in the plate 4.

In order to provide for a liquid-tight joint around the crank shaft 21, a packing nut 26 is provided and packing 27 is interposed between the nut and the shoulder 20. A downwardly depending longitudinal flange 28 is attached or made integral with the cover 18. A cylinder 29 having one end open, is provided with an upwardly extending flange 80 similar to the flange 28. The flange 80 is made to over-lap the flange 28 and both are connected together by the screws or bolts 81, thereby suspending the cylinder 29 in the casing. A piston 82 is fitted to the cylinder and its front end is provided with a recess 88. A piston rod 8 1 is rovided with eyes on both ends, one of of the crank 24 and the other enters the recess and is fitted to the pin 85, thereby connecting the piston to the crank shaft which affords means of reciprocating the piston in the cylinder when movement is imparted to the crank shaft 21. It is understood, of course, that the casing is filled with liquid as shown at A. Concentric apertures 36 and 87 forming a passageway and a seat for the ball check 39, pass through the piston 32. In order to prevent the ball from running out of the aperture 36, a wire holder 40 is fastended to the rear end of the piston extending over the aperture 36. The wire holder 40 is of such dimensions as to per mit the liquid to flow freely into the aperture 36 and force the ball against a seat when the piston is moving in onedirection. In order to regulate the speed of the return action of the door, we provide a novel relief valve. Two lugs 41 and 42 are provided on the rear end of the cylinder in alinement with each other. The upper lug 41 is pro vided with an aperture into which a stem 43 is inserted, having both ends tapered with its lower end adapted to contact with the valve seat 44 of the lug 42. A passage way-45 isformed in the lug 42 and communicating with a passage way 45 formed in the cylinder back of the piston 32. An adjusting screw 46 having its end tapered, threadably engages a threaded aperture in the casing 10" and extends into the casing so as to contact with the tapered top of the stem 43. \Vhen movement is imparted to the adjusting screw 46 its tapered end con.- tacts with the tapered end of the stem 43 moving it up or down thereby opening or closing the valve 47, giving more or less re sistance to the escape of liquid from the cyl inder through the valve and regulating the speed of the return of the door after being opened. The adjusting screw is made liquid-tight by the packing nut 48 and packing 49. Pressure is normally exerted on the stem 48 in an upward direction by a coil spring 50 which constantly holds it in contact with the adjusting screw 46 the force of the spring being exerted against the shoulder 51 of the stem 43.

The operation of our door check is as follows :VVhen pressure is exerted upon the door 1 which carries the casing and operat ing mechanism, the arms 22 and 23 which are secured to the crank shaft 21 are forced in contact with the straight walls of the recesses 7 and 8 of the plate and held sta* tionary. The door and operating mechanism, however, continues moving until the door is open, the movement of the door be ing permitted by the stroke of the piston. It is understood that the casing is filled with the proper liquid. When the door is opened, the piston 32 travels to the end of its forward stroke which is toward the open end of the cylinder, and the oil in the casing gives practically no resistance to the piston as the ball 39 is forced back to its rearward position, leaving the passage ways 45 and 45 clear. When, however, the piston reaches the end of its forward stroke and starts upon its return stroke, impetus is given to the return of the door as the arms of the crank shaft which are made smaller than the recesses 7 and 8 in the door return without resistance until the arms contact with the walls of the plate and star the operating mechanism. The piston is then driven on its return stroke and the ball is forced on the seat 38 and the piston meets with resistance from the liquid as it has no means of getting by the piston except through the passage ways 45 and 45. The opening of the passage v 'ay into the easing is regulated by the adjusting screw 46 which permits more or less liquid to pass through the passage ways, relieving or increasing the pressure against the piston more or less as desired. Attention is called to the fact that the recesses 7 and 8 are made larger than the arms 22 and 23, thereby permitting the door to return immediately without resistance.

It will be fully understood by those skilled in the art that the check herein described is preferably used with a double-acting door hinge, but we do not confine ourselves to its use with a double-acting door hinge or any other device for imparting movement to the door.

Having fully described our inventionwhat we claim is 1. A double-acting door check comprising a casing filled with liquid, a cover for said casing provided with a depending longitudinal flange, means on said casing and cover to form a liquid-tight joint, a crank shaft fitted to said cover with one end depending below and one end projecting above said cover, a cylinder provided having a flange to engage the cover, a piston, means to connect the piston and crank shaft, lugs formed on the rear end of the cylinder, a valve stem having both ends tapered fitted to one of said lugs and adapted to provide a valve to close or open the valve seat in the other lug, an adjusting screw fitted to the casing having its end tapered and adapted to contact with the tapered end of the valve stem to close the valve, a spring surrounding the valve stem exerting a pressure thereon to normally hold the valve on the valve stem in open position.

2. In a door check, in combination with a cylinder and piston therein, an upper and a lower lug provided on the rear end of the cylinder, the lower element having a passage way that at one end terminates in a valve seat and at its opposite end leads into the cylinder, a spring pressed stem having one end engaging said valve seat and having its opposite end extending through the other element justing screw having a cone-pointed end that engages the cone-pointed end of the stem.

8. A double-acting door check comprising and being eone-pointed,and an ad- 7 a casing adapted to be fitted to a door, a cover for said casing having a depending flange, operating mechanism for the check including a crank shaft, a boss integral With said cover, said crank shaft being Vertically journaled and suspended in said boss, a cylinder, a flange provided on the cylinder and adapted to overlap the flange on the casing to provide means for supporting the cylinder and means to permit the door to move a predetermined distance Without resistance from the crank shaft.

4. A double-acting door check comprising a casing'adapted to be fitted to a door, a cover for said casing having a longitudinal flange Which carries all of the operating mechanism of the check and is removable Without disassembling for inspection or repair with the cover, means to retard the operating mechanism, and means to permit slight movement of the door Without resistance from the operating mechanism, substantially as and for the purpose described.

5. In a door check, a pivot post and a cylinder, one of said parts being movable in relation to the other, a socket plate for said post, said post to have a limited amount of rotary movement therein, a crank on said post and a piston in the cylinder connected with said crank.

In testimony whereof We aflix our signatures in presence of two Witnesses.

LEVI D. MALONE. HENRY E. HUBBS.

Witnesses:

H. K. Black, F. B. Wrrr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

